Add reserved 2 Tbsp. oil to skillet and heat; add onion and sauté 8-10 minutes or until tender and slightly caramelized. Remove from heat and cool to room temperature.

Roll out each ball of pizza dough into a 14-inch round and place in a prepared pizza pan or pizza stone. Bake dough for 8 minutes. Remove from heat.

Spread 1 1/2 cups apple pie filling evenly over top of each hot pizza crust. Top each pizza evenly with 1 cup sautéed onion and 6 oz. sausage slices. Sprinkle top of each pizza with 1 1/3 cups shredded cheese. Return pizzas to oven and continue to bake 10-15 minutes or until cheese is melted and crust is golden. Remove from heat.

To Serve: Sprinkle top of each hot pizza with 1 cup shredded arugula and serve, sliced into 8 slices.